Attachment for rules.



C. A. SHUMATE. I

ATTACHMENT FOR RULES.

APPLICATION FILED IULY 11. 1918.

Patepted Nov. 1 2, 1918.

CHARLES A. SHUMATE, or LIMA-OHIO.

ATTACHMENT FOR RULES.

Specification of Letters Patent.

Patented Nov. 12, 1918.

Application filed July 11, 1918. Serial No. 244,407.

To all whom it may concern:

Be it known that I, CHARLES A. SHUMATE, a citizen of the United States, residing at Lima, in the county of Allen and State of Ohio, have invented certain new and useful Improvements in Attachments for Rules; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to Provide an extremely simple and inexpensive, yet an efficient and in every way desirable attachment for rules which will render the latter usable in marking different angles, such as a right angle, 45 degrees, etc.

With the foregoing object in view, the invention resides in the novel construction herein fully described and claimed, the descriptive matter being supplemented by the accompanying drawing forming a part of this specification and in which:

Figure 1 is a perspective view of a rule equipped with the attachment.

Figs. 2 and 3 are sectional views on the planes indicated by the lines 2-2 and 3-3 respectively of Fig. 1.

Figs. 4t and 5 are perspective views of the two brace arms which coact in holding the rule arms in angular relation.

In the drawing above briefly described, the numerals 1 designate the folding arms of a rule, said arms being hinged together at 2 in the usual manner for movement toward and away from each other. A stamped metal brace arm 3 has one end pivoted at 4 to one of the arms 1, the other end of said brace arm being provided with a lateral wing 5 folded substantially upon the arm 3 to form therewith a yielding guide for a second brace arm 6. The arm 6 is also stamped from sheet metal and one end of said arm is pivoted at 7 to the other arm 1. Arm 6 is receivable slidably between the arm 3 and its wing 5 and is adapted to be frictionally gripped between them, whereby it will be held in adjusted position, but in order that the arms 1 may be accurately set at a predetermined angle, the arm 6 is so shaped as to form shoulders 8 at one edge, said shoulders being adapted to abut the arm 3 at the end of the bend which joins the wing 5 to said arm. Any preferred number of shoulders may be employed, but in most cases one will be provided for setting the arms 1 at right angles, and another for locating them at 45 degrees. Whenever desired, the two arms 3 and 6 may be separated and swung onto the arms 1, permitting compact folding of the entire device.

From the foregoing, taken in connection with the accompanying drawing, it will be obvious that although I have provided an extremely simple and inexpensive attachment for rules and thelike, the device will be highly eflicient and desirable. Since probably the best results are obtained from the details shown and described, they are by preference followed, but within the scope of the invention as claimed, numerous minor changes may well be made. Also, it is to be understood that in place of the rule arms 1, any suitable straight edges pivoted together could well be employed.

I claim:

1. An instrument of the class described comprising two straight edges pivoted together, a stamped metal brace arm pivoted at one end to one of said straight edges and having on its other end a lateral wing folded substantially upon said arm, and a second stamped metal brace arm pivoted at one end to the other straight edge, said second brace arm being receivable slidably between said first arm and its wing to be I frictionally gripped thereby.

2. A structure as specified in claim 1, one edge of said second arm having a shoulder to abut said first named arm, whereby to set said straight edges at a predetermined angle.

In testimony whereof I have hereunto set my hand.

I CHARLES A. SHUMATE.

Copies of this patent may be obtained for five cents each, by addressing the Gommiuioner of Patents,

Washington, D. 0. 

